1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16

Diagnostics - Using Scan Tool (Scan)
Code 14 Engine Coolant Temperature (ECT) Sensor Circuit (Scan)
(1
of 2)
ENGINE COOLANT
TEMPERATURE (ECT) SENSOR
ENGINE COOLANT
TEMPERATURE (ECT)
CIRCUIT DESCRIPTION:
DIAGNOSTIC AIDS:
The  Engine  Coolant  Temperature   (ECT)  Sensor
uses a thermistor to control the signal voltage to the
ECM. The ECM applies a voltage on CKT 410 to the
sensor. When the engine coolant is cold, the sensor
(thermistor) resistance  is high, therefore,  the ECM
will see  high signal voltage.  As the engine  coolant
warms, the sensor resistance becomes less, and the
voltage drops. At normal engine operating tempera-
ture, 160-180°F (71-82°C), the voltage will measure
about 1.5 to 2.0 volts.
Check harness routing for a potential short to ground
in CKT 410.
Scan tool  displays engine  temperature in  degrees
Fahrenheit and Celsius. After engine  is started, the
temperature should rise steadily, reach normal oper-
ating temperature, and then stabilize when  thermo-
stat opens.
See “Intermittents” in “Troubleshooting.”
An intermittent problem may be caused by a poor or
corroded connection,  rubbed through wire connec-
tion, a wire that is broken  inside the insulation, or a
corroded wire.
TEST DESCRIPTION:
Number(s) below  refer to circled  number(s) on the
diagnostic chart.
Any circuitry that is suspected as  causing the inter-
mittent complaint should be thoroughly checked  for
backed-out   terminals,   improper   mating,  broken
locks, improperly formed or damaged terminals, poor
terminal-to-wiring  connections, corroded  terminals
and/or wiring, or physical damage to the wiring har-
ness. After repairs,  clear codes following  “Clearing
Codes” in “ECM Self-Diagnostics.”  Failure to do so
may result in codes not properly being cleared.
1.
2.
Code 14 will set if:
Signal voltage indicates  a coolant tempera-
ture above 266°F (130°C).
Signal voltage indicates  a coolant tempera-
ture below –22°F (–30°C).
This test will determine if CKT 410  is shorted to
ground, which will cause the condition  for Code
14.
Index
5C-100 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2  796
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1993, 1994, 1995, 1996, 1997
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- 930 pages
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CopyrightAttribution Non-commercial
(4 votes, average: 4.5 out of 5)
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1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 SKU UPC Model
Nick on Aug 13, 2018. Exactly what I was looking for!

Hugely helpful service manual! Perfect. Thank you!


Sonthaya Traipug on May 04, 2018. Freelance Yachts Service

Manuals are all Important for Technician


Glenn on Dec 02, 2015. Nice

This book is invaluable if you do your own repairs. Great book.


Joseph on Oct 04, 2015. 1997 7.4l Bravo

Could not find a copy until a search brought me here.
Excellent print.
Thank you


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